Hoisting mechanism



J. H. noNAT 1522463 HOISTING MECHANISM Filed April 13. 1923 Patenteddan. n, 1925.

Application 'filed April 13, 1923.

T 0 all whom t may concern Be it known that l, Josnrir citizen of theUnited States, city of New York, borough Queens, in the State of New TGLLES @t GEOGHEGAN, OF

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"GESThGr MECHANESM.

H. Donar, a residing in the and county of York, have invented a certainnew and useful improvement in Hoisting Mechanism,

following is a specitication.

The. invention relates to hoisting` mechanism and more pa to ash-hoistsoperated elect 'signedto .raise ash cans and a cellar to the sidewalk,of inLetters Patent of ed to Joseph H. Donat, 1920, No. 1,333,064, uponinvention is based.

of which the power driven rticularly ric-ally and delilre loads from thetype shown the United States grantdated March 9, which the present Theobject of the invention is to provide simplified and less expensivemechanism for performing the required operations as set forth in theabove Letters P tent, antthe invention consist-s in certain novelfeatures and details of construction by which the above and otherobyects are attained, to be hereinafter described and claimec.

The accompanying drawings forni a part of this 'specification and showan approved .form of the invention.

.Figure 1 is a plan view of a hoisting' head constructed in raccordancewith the invention.

Figure 2 through such head, vtaken on is a vertical transverse sectionthe line 2-2 in Figure 1, and partly in elevation. A

Figure 3 is a side elevation of the controlling lever and certain otherin vertical section.

portions, partly Similar reference numerals indicate the same parts inall the figures.

The horizontally di head is marked 5 and has a '6 disposed verticallyand mounted upon a standard, not shown,

may be understood to he equipped with elevating and of suitableconstruction..

Mounted transversely7 electric motor 7 having a sposed frame of thecylindrical boss adapted to be which as usual and lowering means on theframe is an magnetic brake mechanism 8, and a motor shaft 9 carr TinO' Dat its outer end a pinion 10.

The motor is of an operating me 5 and oseillever 12 having boss ng endof the Serial No. 631,798.

Between the boss 13 and the frame is a collar 1i loosely nfiounted onthe operating shaft 11, having a wide circumferential notch 15 in itsface receiving a narrower lugl 1G on the adjacent face of the boss 13,the arrangement being' such that a movement lof the controller lever tothe left will partially rotate the collar 1st with the shaft 11, whilethe collar will he unaffected by a movement of the ever to the rightwithin the limits ollicred by the length of notch 15 which thus providesthe required lost motion. On the collar is an arm 17 projectingradially, connected by a linlr 13 to a crank-arm 1901i thecontroller-shaft 2O extending into the controller-boi: 21 and operatinga switch, not shown, in the latter and controlling the current to themotor This mechanism is similar to that shown in Letters Patent grantedto Arthur Falkenau, No. 1,452,964 dated April 211, 1923, and, with thespringactuated mechanism 22 on the operatingshaft 11 for automaticallyreturning the controlling lever 12 to the central or neutral position,and for returning the controller shaft 2O and collar 1st to the originalneutral position when the controlling lever 12 is brought back toneutral is fully shown and described in such patent. For this purpose,the controller shaft 2G is provided with a springactuated mechanism, notshown but similar to the abovementioned spring-actuated mechanism Q2,located within the controller hoi; 21, for returning' the controllerIshaft to the neutral normal position when free and correspondinglymoving the collar 1li to the neutral position shown in Figure 1.

r1`he pinion 10 engages the teeth of a gearwheel 23 fixedly mounted onthe overhung end of the hoistii g shaft 2li extending transversely ofthe frame 5 and supported 'in bearings E25 thereon in which it is 'freeto rotate.

@n the shaft 24 adjacent the gearwheel 23, is a flanged hoisting-drinn$36 loosely mounted, and carries a drinn or hub 27 engaged by a frictionband 2S forming' part of a clutch 29 keyed on the shaft 2aand operatedby a cone 30 slidably mounted on the shaft By the movements of the conerelatively to the clutch arm 31. the frictional engagement of the band28 with the hub 27 is varied. The clutch shown is known .as the Conwayand is preferred, but any suitable friction clutch may be employed.,

rlie cone 30 has an annular' groove v32 in Aco its base, and is recessedat 33 to receive an end of a. helical expansion spring 34 encir- KIcling the shaft 24 and abutting` at one end against the frame 5 and atthe other against :he cone, exerting its force in the direction to holdthe clutch normally in strong frictional engagement with the hub 27 ofthe hoisting drum 26 and cause the latter to rotate with the hoisting'shaft 24 when thus engaged.

The cone is moved axially from the hoisting drum in opposition to theforce of the spring 34 by a horizontally disposed forked shifting lever35 pivotally mounted at 36 on an arm 37 projecting inwardly from theframe 5, and has pins 33 lying in the groove 32 of the cone. Theopposite end of the lever 35 extends above the operating shaft 11 andhas an outwardly inclined face vOn the operating' shaft 11 is fixed acollar 40 having an upwardly extended arm 41 standing adjacent theinclined end 39 of the shifting lever and arranged to Contact with theangular face of the latter when the controlling lever 12 is thrown tothe right and thus swing the shifting lever and move the cone in thedirection to release the grip of the band 28 on the hub 2.7 and permitthe hoisting drum 26 to turn independently Yupon the shaft 24 in thedirection to lower the load suspended by a cable 42, shown in dottedlines in Figure 1, wound upon the hoisting drum 26.

The operatlon is as follows :--Assuming that `a load is to be raised,the ycontrolling lever 12 is swung to the left which movement bytheengagement of the lug 16 with the collar 14 turns the latter and throughthe connections 17, 18 and 19 turns the controller shaft 20 and throwsthe switch, not shown, in the controller boX 21 in the direction tosupplv current and actuate the motor to turn the pinion 10. The latterby its meshing with the gearwheel 23 turns the hoisting shaft 24, and asthe clutch 29 is keyed on the shaft and held in strong frictionalengagement with the hoisting drum 26 yby the force of the spring 34, thehoisting drum is caused to rotate with the shaft and the load is lifted.

By returning the controlling lever to the central or neutral position,to which it will be returned automatically if released, by the action ofthe mechanism 22, the current will cut off and the load remainstationarily suspended by the engagement of the now stationary pinionwith the gearwheel 23, the

magnetic brake mechanism 8 aiding to resist rotation of the motor shaftunder these ccnditions.

In lowering the load the controlling lever is swung to the right, thelost motion afforded by the notch and lug 16 permitting such movementwithout imparting motion to the controller shaft 20, and the action nwith said drum of the arm 41 on the inclined end 39 of the shiftinglever swings the latter and slides the cone in opposition to the spring34 to release the grip of the clutchf on thevhub 27 of the hoisting drum26 and permit the hoisting drum to rotate in the reverse direction bythe unwinding of the cable as the load descends by gravity. Bymanipulating the controlling lever to vary the grip of the friction band28 on the hub 27 of theV hoisting' drum, the rapidity of such descentmay be governed or t-he descent checked when desired. The band and hubthus serve as a variable brake for the hoisting-7; drum in the loweringoperation.

The hoisting and lowering is controlled by the single lever 12, and ifby accident or otherwise the lever be released itr will automaticallyassume the neutral position andhold the load suspended until the leverisv again swung` to raise or lower it. The mechanism is simple andeconomical both in construction and operation and can be successfullyand efficiently operated by une-- skilled persons, without danger ofaccident.

To avoid overwinding the cable in the hoisting' operation a limit deviceis added Yconsisting of circuit breaker containedin the casing 43operated by the contact of the.-

or the suspending hook with a'loop 44 305 load through which the cablepasses, on reaching the limit of the upward movement, and arranged tobreak the current when the load has risen to the predetermined height.

I claim:

l. In a mechanism of the character set forth, a hoisting shaft having agearwheel, a hoisting drum loosely mounted on said shaft, a frictionclutch Xed on said shaft and arranged to engage said hoisting drum, amotor, a motor shaft having a pinion in mesh with said gearwheel, abrake for said motor shaft, an operating shaft and connections therefromfor controlling said motor,. a shifting lever for said clutch,controlled by the operating shaft and a controlling lever foroscillating said operating shaft` adapted in one position to actuatesaid motor and hoist a load, and in another posi- `v tion to permit theload to lower by gravity and to control such lowering movementfrictionally by said clutch and brake.

2. In a mechanism of the character set forth, a hoisting shaft, agearwheel and a friction clutch fixed thereon, a hoisting drum looselymounted on said shaft and arranged to be engaged by said clutch, yamotor having a motor shaft and a pinion thereon in mesh with saidgearwheel, a brake for said motor shaft and a controlling lever andconnections therefrom to said motor and clutch, said lever adapted inone position to actuate said motor and engage said clutch to raise aload, and inan otherlposition to stop said motor-and hold said drum withthe load suspended, and in another position to release said drum andpermit the load to lower by gravity and to Control such loweringrotations of said drum by said clutch and brake.

3. 1n a meehanism of the character set forth, a hoisting shaft having agearwheel and a friction clutch iXed thereon, a hoisting drum looselymounted on said shaft and arranged to be engaged by said clutch, thelatter held normally in such engagement by a spring, a motor having amotor shaft and a pinion thereon in mesh with said gearwheel7 a brakefor said motor shaft and a controlling lever and connections therefromto said motor and clutch, adapted in one position to aetuate said motorand engage said clutch with said drum to raise a load, and in anotherposition to stop said motor and hold said drum with the load suspended,and in another position to release said drum in opposition to saidspring and permit the load to lower by gravity, and to control suchlowering rotations of said drum frictionally by said clutch and brake.

In testimony that Claim the invention above set forth I affix mysignature hereto.

JOSEPH H. DONAT.

